And this becomes all the more true as we get older as double Academy Award winning actress Sally Field obviously knows as she's still keeping it up spinning classes as she hurtles towards 70.

The film icon looked sweaty as she left her Brentwood gym on Tuesday with the kind of grimace that says 'job well done.'

Put through her paces: Sally Field looked exhausted after spin class in Brentwood on Tuesday

But she still managed to look great for her age, even after all that exertion.

And the Lincoln actress has a fabulous figure to show off for all her toil, which must make it well worth it.

She admitted was tough to lose the
weight she gained to play the First Lady in Oscar favourite Lincoln but
actress Sally Field certainly showed off the effects of her regime at a
photo-call in Spain in January.

No pain, no gain: Sally seemed to be filling her friend in about the agony of the class

She admitted was tough to lose the weight she gained to play the First Lady in Oscar favourite Lincoln but actress Field certainly showed off the effects of her regime at a photo-call in Spain in January

She showed off her incredible youthful skin as she posed up with co-star Daniel Day-Lewis on the red carpet.

Double Oscar winner Sally opted for a simple red dress with a plunging neckline and capped sleeves which she accesorised with simple silver bangles.

Stunning at 66: Sally looked gorgeous in a simple red dress at the Lincoln photo-call in Spain

The petite actress, who has had roles in movie Mrs Doubtfire and TV favourite ER, said she was forced to gain 25lb to play the First Lady - but decided instead of stuffing herself full of her favouirte fatty foods she would do it the healthy way.

'Mary Todd needed to be quite a bit rounder than me so I had to add a couple of inches to my waistline.

Glowing: Sally looked years younger than 66 as she posed up with Daniel Day-Lewis in Spain

'I ate high-carb protein bars and a lot of brown rice – which sounds good but if you eat enough brown rice, trust me, it isn’t so good any more.

'I also drank a high-protein weight-gain shake, which was horrible. I drank that twice a day with scoops of peanut butter. It took me about seven months to gain the weight and a year to take it off', the actress told The Express.

Nearly a quarter of Americans questioned in an poll think Civil War drama 'Lincoln' should win the Oscar for best picture at the 85th Academy Awards in Los Angeles.

Weight loss: Sally admitted it took her a year to lose the 25lb she gained while playing Mary in Spielberg historical epic

Spielberg was also their top choice for best director, with 36 percent choosing him.

Only 4 percent of Americans thought 'Argo,' which depicts the rescue of American diplomats in Iran in the 1970s, should win the Academy Award for best picture.

Americans chose Daniel Day-Lewis as their clear favorite to follow up his Golden Globe win for his portrayal of Abraham Lincoln with a best actor Oscar.

'Lincoln' was also the top choice in the poll for the supporting categories, with Tommy Lee Jones and Sally Field favorites for their performances in the film.

Comedians Tina Fey and Amy Poehler, who won praise for their first stint hosting the Golden Globes, will be a hard act to follow but 42 percent of Americans approved of the choice of outspoken comedian and creator of 'Family Guy' Seth MacFarlane to helm the Academy Awards.

If given the opportunity to select the host for the Oscars, 15 of people said they would opt for comedian Billy Crystal, followed by 12 percent who chose Ellen DeGeneres while 10 percent wanted Steve Martin.